The world's longest known cave system.

Breathtakingly blue walls shimmer inside the "Glacier Behind the Town."

The curiosities and wonders of pharmacy in a delightful historic building.

A modernist landscape of water and sci-fi concrete.

A museum dedicated to the alleged Roswell Incident.

Take a drunken tour inside the world's largest known geode.

This incredible collection of vintage pinball machines can be played at 25 cents a pop.

Where America's first doomsday cult awaited the end of the world.

Where beautiful signs live on forever.

A favorite haunt of dinosaur loving children and hallucinogen loving hippies alike.

In the middle of an extremely unforgiving and desolate high desert is the most secret military facility in the world.

An underwater city for the dead.

This 4,000-foot-diameter hole is touted as "the most well known, best preserved meteorite crater on Earth."

An abandoned facility that has become a place of ritualistic satanic worship, or so rumor has it.

One person's lost luggage is another person's treasure.

A walk-in working camera obscura produces 360-degree live images of the San Francisco coast.

A museum befitting the city responsible for supplying the majority of the world's LSD.

One of the tallest buildings in Iceland, and perhaps, the most visually impressive.

Tour the dark and beloved poet's former cobwebbed basement, which may have inspired "The Black Cat."

A museum dedicated to the history and exploration of both popular music and science fiction.

This lab's maddening silence is good for business but bad for sanity.

A stunning, two-tiered waterfall made famous by poets, artists and the legend of a ghost dog.

This abandoned asylum was once a state of the art facility before devolving into one of the most deadly mental institutions in American history.

Hollowed out cedar log tubs set in an ancient towering forest.